ABB REM545 Protection Relay

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• 1. Product Overview

  The ABB REM545 Protection Relay is a high-performance digital protection relay for low-voltage distribution systems, designed for industrial and commercial applications. It integrates multiple protection functions including overcurrent, overload, short-circuit, phase-to-phase fault, and ground fault protection, providing comprehensive monitoring and protection for low-voltage networks and critical equipment.

  REM545 supports communication protocols such as Modbus RTU, allowing seamless integration with automation and distribution monitoring systems for remote control and monitoring, enhancing system safety and reliability.

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  2. Technical Specifications

  • Model: REM545

  • Type: Low-Voltage Distribution Protection Relay

  • Rated Operating Voltage: AC 230 V / DC 110 V

  • Supply Frequency: 50/60 Hz

  • Protection Functions: Overcurrent, short-circuit, ground fault, phase-sequence, overload protection

  • Measurement Range: Current 0.1 – 100 A; Voltage 100 – 500 V

  • Digital Communication Interface: RS-485, supports Modbus RTU

  • Display: LCD shows current, voltage, and fault status

  • Trip Time: < 30 ms (fast protection response)

  • Operating Temperature: -20 to +60 °C

  • Storage Temperature: -40 to +70 °C

  • Protection Rating: IP40

  • Dimensions (W × H × D): 96 × 96 × 65 mm

  • Mounting: Panel-mount

  • Weight: ~0.5 kg

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  3. Key Advantages & Features

  1. Multi-Function Protection
     Integrates overcurrent, short-circuit, ground fault, phase-sequence, and overload protection for safe and stable operation of distribution systems.

  2. Digital Display and Monitoring
     LCD displays voltage, current, and fault information for easy local and remote monitoring.

  3. Fast Response
     Trip time < 30 ms ensures rapid disconnection during faults to protect equipment.

  4. Comprehensive Communication
     Built-in RS-485 interface supports Modbus RTU for easy integration with automation systems.

  5. High Reliability
     Designed for industrial environments with strong interference immunity for long-term stable operation.

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  4. Typical Applications

  • Industrial low-voltage distribution systems

  • Commercial building power protection

  • Distribution panels and control centers

  • Automation production line electrical protection

  • Motor drive systems and critical equipment protection

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  5. Installation & Usage Notes

  1. Verify relay rated voltage, current, and protection functions meet system requirements before installation.

  2. Ensure wiring connections are correct to avoid misoperation.

  3. Install in well-ventilated, non-corrosive environments.

  4. Periodically check relay and wiring for reliable operation.

  5. Settings and parameter adjustments should be performed by qualified personnel to prevent unintended tripping.

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The structure and details of the product：

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